Maggi's sauce, liquid smoke or just MSG maybe?

It’s hard to say how bland a recipe is without seeing it, but generally speaking what you get out of worcestershire sauce is slight sweetness, tang, and umami.

You could go about this a few ways…

If it’s in so many recipes of yours then perhaps it would be worth making the sauce yourself. The most important ingredient imo is tamarind paste, as long as you have that accessible to you it shouldn’t be too difficult. Up to you if you want to go so far as to properly ferment the sauce but quick versions do exist, they just don’t hold as much complexity flavour wise.

If not for making the sauce completely then you can borrow some of the ingredients in it to toss in your food. Tamarind paste contributes to that unique tanginess and some of the sweetness. Soy sauce or liquid aminos will give umami. Vinegar or lime juice cuts through the sweetness, enhances tang, and generally brightens flavours. Molasses is in there too usually but its a bit of a pain to work with imo not only because its so sticky but its also easy to overdo.

Theres a bunch of spices in there too but I think you can just throw whatever spices a recipe calls for in your food or whatever is to your taste. For example I’m always throwing in garlic powder and bay leaf in my food because I like how it tastes and it pairs with anything.

If you can find vegan bbq sauce, that might be an option as well. Worcestershire is in there usually and it has that tang/sweet element.

Worcestershire sauce is one of those instant flavour enhancer ingredients. You don’t need it but it sure makes food palatable in a pinch.

deeply reduced mushroom stock

I've found that steak sauces like A1 are generally vegan and have a similar flavor profile to Worcestershire

Vegan Worcestershire exists. I have some in my fridge.